The inferior anti-smudge properties and compromised anti-corrosion performance of waterborne polyurethanes (WPUs) stem from the presence of abundant hydrophilic groups in their polymer networks. Despite various hydrophobic segments have been introduced in WPU skeleton to lower the impacts of hydrophilic groups, the limited migration capability of hydrophobic segments in waterborne matrix often result in unsatisfactory performance. Herein, we fabricate a multifunctional PDMS-modulated WPU coating employing sorbitan monooleate (SP), a renewable bio-derived polyol, as an internal crosslink agent, and hexamethoxymethylmelamine (HMMM) as a post-crosslink agent to fully eliminate the polar hydrophilic groups in the molecular linkages and further enhance the crosslink density of the coating. It is found that the coating exhibits exceptional anti-graffiti and self-cleaning effects when subjected to tests involving oil-based and water-based pens and inks, as well as common household liquids like milk, coffee, cooking oil, ethanol, n-hexadecane, etc. Such anti-smudge coating could readily remove carbon powder-like dust with water, ensuring a clean surface, and also possess a certain level of resistance to fingerprint smudges. Apart from excellent mechanical robustness and impressed durability after 500 cycles of writing erase tests, the coating also remains intact and has anti-smudge properties when folded or bent. For chemical resistance, the coating can resist at least 18 h of acid, alkali, and salt intrusion without being damaged. Moreover, the sufficient crosslink density imparts the coating with good thermal stability and outstanding anti-corrosion performance in extremely corrosive environments. This research presents a facile and effective approach for developing stain and corrosion-resistant PDMS-modulated waterborne polyurethane materials with high protective reliability and long lifespan through the dual-crosslinking strategy.

中文翻译：

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水性聚氨酯涂料的双交联策略可实现出色的防污和防腐性能

水性聚氨酯 (WPU) 的防污性能较差，防腐性能较差，原因在于其聚合物网络中存在丰富的亲水基团。尽管在WPU骨架中引入了各种疏水性链段来降低亲水基团的影响，但疏水性链段在水性基质中的迁移能力有限，常常导致性能不理想。在此，我们制造了一种多功能PDMS调制的WPU涂层，采用脱水山梨醇单油酸酯（SP）（一种可再生的生物衍生多元醇）作为内交联剂，并使用六甲氧基甲基三聚氰胺（HMMM）作为后交联剂，以完全消除极性亲水基团分子键，进一步提高涂层的交联密度。研究发现，该涂层在油性和水性笔墨以及牛奶、咖啡、食用油、乙醇、n-等常见家用液体的测试中表现出优异的防涂鸦和自清洁效果。这种防污涂层可以很容易地用水去除碳粉状灰尘，保证表面清洁，并且还具有一定程度的抗指纹污迹的能力。除了在 500 次书写擦除测试后具有出色的机械强度和令人印象深刻的耐用性外，该涂层在折叠或弯曲时也保持完整并具有防污性能。耐化学性方面，涂层可抵抗至少18小时的酸、碱、盐侵入而不被损坏。而且，足够的交联密度赋予涂层良好的热稳定性和在极端腐蚀环境下优异的防腐性能。这项研究提出了一种简便有效的方法，通过双交联策略开发具有高防护可靠性和长使用寿命的耐污渍和耐腐蚀的PDMS调制水性聚氨酯材料。